In this paper, a co-polarized, co-located electric and magnetic dipoles(CCEMD) with high isolation is presented. The antenna consists of a loop based on segmented line and two independent feeding ports. Two modes of t...In this paper, a co-polarized, co-located electric and magnetic dipoles(CCEMD) with high isolation is presented. The antenna consists of a loop based on segmented line and two independent feeding ports. Two modes of the antenna are exited separately, the first one has a radiation pattern equivalent to an electric dipole by exciting anti-phase current with symmetric distribution, and the second one is like a magnetic dipole by exciting uniform and in-phase currents along the loop. The antenna is fabricated and tested. Its measured common-10 d B impedance bandwidth at two ports is 280 MHz(2.32-2.6 GHz) with isolation better than 41 d B. Its MIMO performance in terms of capacity gain(CG) over the SISO system is investigated in a multipath rich environment containing two parallel PEC planes by both measurements and image theory based simulations. Results show that, in free space, the CG results are just slightly larger than 1, however, in the multipath rich channel, the CG values are very close to 2, which indicates that two separate subchannels can be achieved by the proposed CCEMD. The measured results of CG agree well with that obtained by simulation.展开更多
The effect of aspect ratio (width-to-length ratio) on overall radiation characteristics of a rectangular microstrip patch antenna is theoretically investigated with a view to develop a concrete physical insight in to ...The effect of aspect ratio (width-to-length ratio) on overall radiation characteristics of a rectangular microstrip patch antenna is theoretically investigated with a view to develop a concrete physical insight in to the phenomenon. The detailed variation of co polarized and cross polarized radiation performance as a function of aspect ratio is thoroughly presented. The gain enhancement of a microstrip patch antenna along with a radical variation of cross polarized field radiation with aspect ratio is obtained. Indeed the conjecture of occurring different fringing fields with different aspect ratio is employed to theoretically estimate the effective size of a rectangular patch, and hence to determine the quantitative change in the gain value. Close agreement amongst the theory and simulations justifies the conjecture indicating a concrete physical insight in to the fact. The aspect ratio for which the cross polarized field radiation is minimum for a particular patch is also presented and justified quantitatively.展开更多
基金supported by the National Natural Science Foundations of China (61771435)
文摘In this paper, a co-polarized, co-located electric and magnetic dipoles(CCEMD) with high isolation is presented. The antenna consists of a loop based on segmented line and two independent feeding ports. Two modes of the antenna are exited separately, the first one has a radiation pattern equivalent to an electric dipole by exciting anti-phase current with symmetric distribution, and the second one is like a magnetic dipole by exciting uniform and in-phase currents along the loop. The antenna is fabricated and tested. Its measured common-10 d B impedance bandwidth at two ports is 280 MHz(2.32-2.6 GHz) with isolation better than 41 d B. Its MIMO performance in terms of capacity gain(CG) over the SISO system is investigated in a multipath rich environment containing two parallel PEC planes by both measurements and image theory based simulations. Results show that, in free space, the CG results are just slightly larger than 1, however, in the multipath rich channel, the CG values are very close to 2, which indicates that two separate subchannels can be achieved by the proposed CCEMD. The measured results of CG agree well with that obtained by simulation.
文摘The effect of aspect ratio (width-to-length ratio) on overall radiation characteristics of a rectangular microstrip patch antenna is theoretically investigated with a view to develop a concrete physical insight in to the phenomenon. The detailed variation of co polarized and cross polarized radiation performance as a function of aspect ratio is thoroughly presented. The gain enhancement of a microstrip patch antenna along with a radical variation of cross polarized field radiation with aspect ratio is obtained. Indeed the conjecture of occurring different fringing fields with different aspect ratio is employed to theoretically estimate the effective size of a rectangular patch, and hence to determine the quantitative change in the gain value. Close agreement amongst the theory and simulations justifies the conjecture indicating a concrete physical insight in to the fact. The aspect ratio for which the cross polarized field radiation is minimum for a particular patch is also presented and justified quantitatively.
